Door lock



June 20, .1939. F. s. s. ARMSTRONG 2,162,929

DOOR LOCK Filed Feb. 3, 1937 2 Sheets-Sheetl F. G. G. ARMSTRONG DOOR LOCK June 20; 1939.

Fild Feb. 5, 1957 2 Sheets-Sheet 2 20 t 33 EU gb E10 door lock. L

Patented 1m .20, 1939 I 2,162,929, L

UNITED STATES PATENT'OFFICE noon Loon Fullerton George Gordon Armstrong, Beverley,

- East Yorkshire, England 1 Application February 3, 1937, Serial No.- 123,924

In Great Britain February 28, 1936 zoiaims. (011924535) The present invention relates to door locks and Figure 7 is a corresponding plan view partly has for its object the provision of means for enin section. abling a lock to be operated quietly and with cer- Figure 8 is a sectional plan ,of the operativetalnty on the closing movement. Accordingly the end of 'a door lock of a still further modified invention is particularly applicable to doors for form of construction with the door in a partially 5 automobiles and other vehicles. closed but locked position incapable of retrac According to the present invention and from tion without operating the handle of, the lock. one aspect thereof a resiliently loaded trip mech-v Figure 9 is a corresponding sectional plan view anism is disposed in the pathof movement of a of the operative end of the door lock of Figure 8 10 resiliently loaded lock bolt to limit its displacebut with the door in its fullyclosed and locked 10 t ment in the locking direction from the fully reposition. tracted to the fully projected position until the Figure 1!) is an end view of the bolt of Figure 9. trip mechanism is released. I In the construction according to Figures 1 and It will thus been seen that after opening of 2 the lock has a. base. plate 20 forming a part door to which a lock of the present invention is of the lock casing, which base plate carries a fixed 15 attached the. release of the handle in operative u e for a ding bolt 22 which is provided engagement with the bolt enables the latter with ribs 23, 24, 25, on its rear face. A'spring 26 a under the action of its resilient load to move is anchored at 21 to the base plate and its opautomatically from the fully retracted position ,posite and extends into the space between the r 20 to a partially retracted position ready for the ribs 24, 25, of the bolt and between the' rear 20' succeeding act of closing the door, whereby only face of the bolt and the base plate 20, the effect the release of the bolt from the partially reoi this spring being to force the'bolt towards its trated position to thefully projected positionis oclred position. required to complete the closing. The release of A cam 28 is carried by an operating member the trip mechanism is effected preferably by the 29 which has a rectangular bore 30 therein for 25 act of commencing the final movement of closing,' the reception of the spindle of the lock handle.- that is to say it is automatic with commencement The operating member 29 is of circular external of displacement of the bolt from the artially rep r p ery nd is mounted for, rotation within a tracted position to the fully projected position. circular bore 3| of the guide member 2| so 30 ,The bolt, as in ordinary door locks, may be that on angular displacement of the lock handle 30 longitudinally displaced by the operation of an about its spindle the cam 13; is angularly displaced angularly displaceable handle said displacement relatively to the base plate 20. 111 said angular in the looking direction being assisted by a displacement the part 32 of the cam is adapted to spring andbeing resisted in the opposite direction engage with the rib 23 of the bolt to force this in a thereby. retracted direction. 35

The invention is more particularly described A rubber pad 33 is carried by the base plate 20 with reference to the accompanying drawings, in and is seated against a rib 34 of said base plate, which: h I said rubber pad beingengaged by the rib 24 of the Figure 1 is a view in elevation of one form of bolt when the latteris released to take up its a locking position under the action of the spring Figure 2 is acorresponding sectional plan view 25. ,The provision of this rubber bufier 33 thus but showing a safety catch associated with the ensures silence of operation during locking.

door lock of Figure 1. Atrip member consistlngoialever35is pivotally Figure 3 is a; plan view partly in section of mounted at 36 to the outer face of the plate mem- 5 the operative end of a modified form of door lock ber20. In the normal position of this trip member without the operation of the lock handle.' 31 of a catch 38 on the-door frame. The pivotal 50 when the door is approaching. the closed position. one arm 35a is adapted to pass through a slot 360 I Figure 4 is a: corresponding sectional plan of in the base plate 20 whilst the other arm'35b on. a lock according to Figure 3 but when the door is pivotal closing movement of the door is adapted p rtially closed but locked to prevent retraction ultimately to come into contact with a projection Figure 519a corresponding sectional plan view member 35 is normally. maintained in the posibut with the doorin its fully closed and locked tionshown in Figure Qzby a spring 39. position. The'catch'oh the doorfranie' has a recess 40, I Figure 6 is an elevation of a further modified the locking lace of the catch-being shown at ll. formofcoustruetion. we In the fully closed position of the door this locking face 4! of the catch is engaged by a locking face 42 on 'an enlarged head 22a of the bolt, This locking face 42 of the bolt may. be

- uniplanar or again it may be slightly tapered or notched. I

In operation, in'order to open the door the haddle is turned in an anticlockwise direction whereupon the bolt 22 is moved against the spring from the position shown. in chain dotted lines in Figure 1' to the position shownv in full lines 'in Figures 1 and 2. Immediately the rib 22 passes to the left of the'end of the armiiid onthe fever the latter, under the action I the spring 39 takes up the position shown Figure 2 of "the drawings so that on release of the handle the bolt is prevented from returning to its locked position. In this position the spring 25 merely funfliions to retain the rib 23 in contact with the arm 35 of the trip mechanism and is consistent witlrthe position in which the bolt is neither fully retracted'nor in the locked state'but is intermediate the two positions. when itis desired to close the door then a push is exerted on the door or the handle without rotating the'latter and the door is angularly displaced towards the frame until the free end 35bof the trip lever comes into contact with. the projection 31, whereupon the lever 35 is angularly displaced about its pivot 36 to take up a position substantially parallel with the base plate 20 thus enabling the bolt to be longitudinally displaced into the locked -position with the enlarged head 22a of the bolt within the recess 40 and the face 42 of the bolt in contact with the face 4| of the catch. 3 In order to prevent'unauthorised opening' of the door when closed a lever 43 pivotally mounted on the base plate at 44 and normally retained in the position shown in Figure 1 by a spring 45 isadapted on operation by a key to be an gularly displaced about the pivot 44 to'bring the free end 46 of the lever within a notch 41 in the cam member 28 thereby preventing movement of the cam member in an anticlockwise'direction or? manual operation of thr handle; In the modified form of construction shown in Figures 3-5 the enlarged end 22a of the bolt carries a spring controlled tongue 43 which .ha'sa spherical end 49 to enable it to be angularly displaced within a complementary recess in the bolt head. A spring 50 is adapted to hold the tongue normally in the position shown in Figure 3.,

. a catch-52 which has a pair of shoulders 53'; 54,

The frame SI 'of the door has secured thereto adapted for engagement by the tongue 48. In

this construction, on closing the door 'the tongue 48 rides'over a face 55 of the catch while the bolt Q 22 is held by the trip' member '35.] On nearingthe closed position with the door only slightly ajar the tongue 48 comes into engagement with the shoulder 53 as shown in Figure 4, and in this position the door is partially closed'butloclred in that it cannot be" retracted "without operation 'of the handle to. withdraw the bolt to a position in which the rlb 23 on the'bolt abuts against the rib 34 on the base-plate-3lt. In this position, the tongue 48 is clear of the shoulder 53, .as'indi-\ cated by thedotted line position of the tongue in Figured, so that the door may be opened. Thus,- opening of the door is effected by furtherretraction of the bolt beyond its partially retracted position. On further closing "of the door,. that is to; say whenthe bolt member hasfreached a' Dosition slightlyinwardly of the shoulder 54 on the catch, the trip member 3! is released to 'per-.

mit' the bolt to slide forward under the action this case a spindle 56 passing through'the base plate 20 has at one endan arm 51 extending at right angles .to the spindle, the inner face of the depending portion of the arm 51 being curved includes 'a modified form of trip mechanism. In 5 at 5 8. The opposite end of the spindle 56 carries 10 a buffer 59 between which and the base plate 24 a spring 60 is located. The head 22a ofthe bolt is notched at M and' its locking face is tapered ,at 62. In this construction also the catch on the door frame is modified in that the safety catch 15 63 spring controlled at 64 is provided in the frame in advance of the recess 40.

On operation of the handle to open the door the bolt is displaced towards its retracted position to such an extent that on release of the handle the 20 lower end of the arm 51 engages within the notch 6| of the bolt head. This is assisted by the action .of the spring 60 which tehds to force the buffer 58 away from the base platev 2land thus pull the arm 51 into the notch 6|. On closi ng the door 25 without operation of the handle the. head 22a first of all depresses the safety catch 43 against a spring 84 and having passed the catchpermits its release so that the door when partially closed is prevented fromretraction without operation of 30 the handle. On further closing movement the spring 50 is compressedby engagement 0f the buiferifl with the projection 31 to release the arm 51 from engagement within the notch CI of the bolt, whereupon the bolt under the action-of 35 the spring 26 enters the recess 40 of the door catch. The safety catch 83 of Figure 7 may be used with the bolt construction shown in Figures 1 and 2. For purposes of illustration, the safety catch 63 isshown in Figure 2.

. 40 In the further modified form of construction A illustrated in Figures 8-10 a. trip member of the type shown in Figures 1-5 is utilized whilst the door frame carries a catch which has two looking faces 4|; 65. In this construction the bolt 45 head itself carries an auxiliary bolt member or safety catch 66 which has ashoulder fl thereon between which and a bracket 6! on the b'olt,22

is located a'spring 89 which exerts a lesser force against the catch 66 than the spring 28 exerts 50 against the bolt 22 sothat the catch 88" may be shifted independently of the "bolt when it comes into engagement with the locking faces.

In this construction during closing of thedoor y the bolt 22 when retained by the trip is adapted 55 to pass clear of the outer edges of the shoulders or looking faces 4|, of the catch on the frame but the auxiliary bo'lt or safety catch 40 is per- I mitted displacementaunder, the action of. the

spring 69. Accordingly,-oi1 approaching the locking position the catches, in the bolt head first engages with the locking face 55 of the catch of the door frame as shown in. Figure 8 and in this I position the door is partially closed but looked, that is to say, it is prevented from ret til the handle is operated. On coinpljtion ofjthe closing movement, that is to sayQbythe time the' locking face of the bolt 22 has conie into align ment with the locking face 4| of the door catch,-

the trip member I! is operated to release the bolt so that this takes up., the positi0n shown in Figure 9 in which the dobr isboth fully closed and locked. Inorder to open the door from the, position shown in Figure 8, it is simply necessiiry to further retract the-bolt by, operation of the handle so that the catch 66 will clear the shoulder 65 on the door frame.

It is to be clearly understood that various changes in the details of construction and arrangement of parts may be made without departing from the scope of the invention as set forth in the appended claims.

I declare that what I claim is:

1. In a lock for doors, pivotally mounted for angular displacement relatively to door frames the provision of a bolt, resilient means urging said bolt towards its projected position, a trip member, a manually operated handle for retracting said bolt against said resilient means, resilient means urging said trip member into engagement with said bolt to interrupt the movement of said bolt from its retracted to its projected position until automatic release of said trip member is effected during final closing movement of said door, and a safety catch member slidably mounted on said bolt to project therefrom for engagement by said frame during retention of said belt by said trip member when said door approaches the plane of said frame prior to locking, to prevent withdrawal of said door relatively to said frame except on operation of said handle.

2. A lock for doors comprising a bolt, resilient means for resisting the displacement of said bolt in the retracting direction, means for retracting said bolt in opposition to said resilient means, a resilient pressed trip member disposed in the path of movement of said bolt for maintaining said bolt in partially retracted during final closing movement of the door, a safety catch carried by said bolt and having limited movement independent of said bolt and adapted to cooperate with a portion of the door frame for preventing opening of the, door when said bolt is maintained in its partially retracted position except by operation of said retracting means, and spring means operating against said safety catch for normally urging the same to a position for cooperation with the frame.

FULLERTON GEORGE GORDON ARMSTRONG.

position until released 

